From: Jonathan Lundell <jlundell@pobox.com>
To: linux-kernel@vger.kernel.org
Subject: Re: How to know HZ from userspace?
Date: Wed, 30 May 2001 17:24:37 -0700 [thread overview]
Message-ID: <p05100316b73b3f2e80e2@[10.128.7.49]> (raw)
In-Reply-To: <9f41vq$our$1@cesium.transmeta.com>
In-Reply-To: <20010530203725.H27719@corellia.laforge.distro.conectiva> <9f41vq$our$1@cesium.transmeta.com>
At 5:07 PM -0700 2001-05-30, H. Peter Anvin wrote:
> > If you now want to set those values from a userspace program / script in
>> a portable manner, you need to be able to find out of HZ of the currently
>> running kernel.
>>
>
>Yes, but that's because the interfaces are broken. The decision has
>been that these values should be exported using the default HZ for the
>architecture, and that it is the kernel's responsibility to scale them
>when HZ != USER_HZ. I don't know if any work has been done in this
>area.
FWIW (perhaps not much in this context), the POSIX way is sysconf(_SC_CLK_TCK)
POSIX sysconf is pretty useful for this kind of thing (not just HZ, either).
--
/Jonathan Lundell.
next prev parent reply other threads:[~2001-05-31 0:25 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-30 23:37 Harald Welte
2001-05-31 0:07 ` H. Peter Anvin
2001-05-31 0:22 ` Joel Becker
2001-06-01 1:57 ` Ralf Baechle
2001-06-01 4:12 ` H. Peter Anvin
2001-06-01 8:17 ` Chris Wedgwood
2001-05-31 0:24 ` Jonathan Lundell [this message]
2001-05-31 0:38 ` Joel Becker
2001-05-31 1:17 ` Martin Dalecki
2001-05-31 0:44 ` Jonathan Lundell
2001-05-31 1:02 ` Mike Castle
2001-05-31 17:12 ` Daniel Phillips
2001-05-31 3:23 ` Albert D. Cahalan
2001-05-31 3:40 ` Albert D. Cahalan
2001-05-31 15:52 ` Harald Welte
2001-05-31 17:06 ` H. Peter Anvin
2001-06-03 23:14 ` Erik Tews
2001-06-06 18:09 ` Tomas Telensky
2001-06-06 18:22 ` Harald Welte
2001-06-06 18:59 ` Tomas Telensky
2001-06-06 20:47 ` Harald Welte
2001-06-06 20:55 ` Linus Torvalds
2001-06-06 23:59 ` Chris Wedgwood
[not found] <XFMail.20010601083302.peterw@dascom.com.au>
2001-05-31 22:43 ` H. Peter Anvin
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